when the shtf it will be events spread over many years. First is the warming that we are now experiencing. It will continue and then escalate - need to watch the next 5 years, as an escalation may be underway. Eventually, regardless of timelines the warming will be undeniable.

Then the gods return in the form of rocks - comets and asteroids - pann-starrs (pagan god pan...etc - many rocks named after gods lol)

Then the sun goes to war with them - that's the mythological (but true) war in the heavens and both sides will suffer including the entire inner solar system.